Pattern of a writing instrument barrel



FIG.1 is a front elevational view according to the present invention;

FIG. 2 is a right side elevational view of FIG. 1, the left side being identical to the right side;

FIG. 3 is a rear elevational view of FIG. 1;

FIG. 4 is a top plan view of FIG. 1;

FIG. 5 is a bottom plan view of FIG. 1; and,

FIG. 6 is a perspective view of FIG. 1.

The broken lines showing of a writing instrument in FIGS. 1-6 are for illustrative purposes only and form no parts of the claimed design. 

The ornamental design for a pattern of a writing instrument barrel, as shown and described. 